Improvement in pipe-tongs



\ I. J. OORBIN. r Pipe-Tongs'.

No. 203,593. Patented May14, 1878.

UNITED STATES PATENT OFFIoE.

JOHN COBB IN, 0F DANBURY, GONNEOTIGUT, ASSIGNOR T0 HIMSELF AND ADELIA J.OOWL, OF BROOKLYN, NEW YORK.

IMPROVEMENT lN PlPE-TONGS.

Specification forming part of Letters Patent N0. 203,593, dated May 14,1878; application filed February 4, 1578.

To all whom it may concern:

Be it known that I, J oruv OoRBIN, of Danbury, in the State ofConnecticut, have invented an Improvement in Pipe Tongs, of which thefollowing is a specification:

Pipe-ton gs have been made in which the fulcrum screw or pin is within aslot in one of the levers, into which slot an adjusting-screw isapplied, to hold the fulcrum pin and regulate the distance between thehooked and chisel-edged jaws. This slot-screw is liable to become wornand inoperative, and it projects beyond the lever-handles and ofteninterferes with the insertion of the' tongs into small spaces.

My invention consists in the combination,

2 with the slotted lever-handle and jaws of the pipewrench, of apolygonal blocking-piece and clamping-screw, whereby the position of thefulcrum-stud in the slot is determined, to adapt the tongs to varioussizes of pipes. I also construct the fulcrum-stud so that it may beturned around, for compensating Wear upon the chisel end of the jaw andthe interior surface of the other jaw.

In the drawing, Figure l is an elevation of the pipe-tongs complete, andFig. 2 is a section at the line w w.

The hook-ended jaw a, with the lever b and slot at o, are similar tothat before made; and

- the chisel-ended jaw d and lever e are also of usual character.

Instead of a screw through the lever b passing endwise into the slot 0,I employ the block.- ing-piece g, connected by the clamping-screw 'i,and having two or more faces, 2 3 4 5, at different distances from thescrew i, so that it may be turned around and clamped to allow thefulcrum-pin lto stop against either of the faces, and thereby regulatethe distance that ent distances from the body of such fulcrumpin. Hence,by turningthat pin into different positions in the slot, the distancebetween the jaws will be varied. Thus the pipe-tongs that are made withthe polygonal blocking-piece adapted to the regular sizes of pipe willnot be rendered useless by wear upon the jaws, because that wear can becompensated by turning the fulcrum-pin Z with the side of its head totake against the polygonal blockingpiec'e farther from the center ofsuch pin than the one before employed.

I claim as my invention 1. The combination, with the pipe tongs havingthe jaws d a, handle-levers b e, and slot 0, of the polygonalblocking-piece g and its clamping screw 'i and separate pivot l,substantially as set forth. j

2. The combination, with the pipe-tongs and polygonal blocking-piece, ofthe fulcrum-stud having a head, the edges of which are at differentdistances from such stud, substantially as set forth.

Signed by me this 17th day of October, A.

JOHN OOBBIN.

Witnesses GEO. T. PINOKNEY, OHAs. H. SMITH.

